Macklemore & Ryan Lewis, up for six Moon Men at this year's ceremony, will perform their gay rights anthem "Same Love," while making history as the first artists to perform at all three of MTV's major televised events (mtvU Woodies, MTV Movie Awards and the VMAs) in a single calendar year.

Mars, up for four trophies, will debut his brand-new single on the VMA stage.

The VMAs are set for Aug. 25 at Brooklyn's Barclays Center. The show will air live on the East Coast at 9 p.m. with a tape delayed broadcast for the West Coast.